|Serpentine in the upper canyon. Serpentine is highly altered mantle material.|
|Altered ultramafic rocks from the upper canyon|
|Chromite ore from the upper part of Del Puerto Canyon|
|Peridotite from the upper reaches of Del Puerto Canyon|
If you want to pay a visit to Del Puerto Canyon, it can best be accessed from the town of Patterson in the Central Valley southwest of Modesto. A road (Mines Road) reaches the area from Livermore, and a slow winding road travels over Mt. Hamilton and Lick Observatory from San Jose in the Bay Area. There is a campground and day use area in the upper canyon (Frank Raines Park and Minniear Day Use), but most of the rest of the canyon is private land. Stay on the road!